\[\boxed{\text{7\ (7).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[1)\ \left( \frac{4^{\backslash 2}}{9} - \frac{5^{\backslash 3}}{6} \right)\ :\left( - \frac{14}{27} \right) =\]
\[= \left( \frac{8 - 15}{18} \right):\left( - \frac{14}{27} \right) =\]
\[= - \frac{7}{18} \cdot \left( - \frac{27}{14} \right) = \frac{1 \cdot 3}{2 \cdot 2} = \frac{3}{4}\]
\[2) - 1,5 \cdot 4 - 2 = - 6 - 2 = - 8\]
\[3)\ ( - 1,9 + 0,9) \cdot ( - 1,9 - 0,9) =\]
\[= - 1 \cdot ( - 2,8) = 2,8\]
\[4)\ (6 - 8)^{3} = ( - 2)^{3} = - 8\]